I couldn't find a source anywhere that indicated a babygram for bilious vomiting. I don't have access to AMBOSS, so I can't verify it there, but other sites recommend an abdominal X-ray. The graphic in "Extra" also says to do an abdominal X-ray. I think this distinction is important as we want to limit the amount of radiation in neonates.

- https://radiopaedia.org/articles/neonatal-bilious-vomiting
- https://www.radiologyinfo.org/en/info/acs-vomiting-infant
- https://www.aafp.org/pubs/afp/issues/2000/0501/p2791.html
Source: Society Guidelines - https://acsearch.acr.org/docs/69445/Narrative/